No. Cel-Fi simply extends the cellular service of an operator indoors and anyone with a handset may use it. It comes preconfigured and you just plug it in.
Please Note: Current FCC regulations in the United States do require all boosters users to register their devices. Look for a leaflet in your Cel-Fi carton for information on whether you need to register it. Some operators, such as T-Mobile in the U.S., preregister the systems they distribute so no registration by the consumer is necessary.
For more information please read the FAQ article: "How do I Register my booster?"